Page "Carl Nägeli" Paragraph 3

It was thought that Nägeli had first observed cell division during the formation of pollen, in 1842.

However, this is disputed by Henry Harris, who writes: " What Nägeli saw and did not see in plant material at about the same time Robert Remak is somewhat obscure ...

I conclude ... that, unlike Remak, he did not observe nuclear division ... it is clear that Nägeli did not in 1844 have any idea of the importance of the nucleus in the life of the cell.